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Symptom: P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW - DIESEL When Monitored and Set Condition: P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW - DIESEL When Monitored: With the ignition on. Set Condition: The PCM detects voltage on the ambient/battery temperature sensor signal circuit below 0.08 volt for more than 3 seconds. POSSIBLE CAUSES INTERMITTENT CONDITION AMBIENT/BATTERY TEMPERATURE SENSOR AMBIENT/BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND AMB/BATT TEMP SENSOR SIGNAL AND SENSOR GROUND CIRCUITS SHORTED TOGETHER POWERTRAIN CONTROL MODULE (SHORT TO GROUND INTERNALLY) TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → No → 2 Turn the ignition off. All Yes → Replace the Ambient/Battery Temperature Sensor. No → 3 Turn the ignition off. All Yes → No → Repair the Ambient/Battery Temperature Sensor Signal circuit 29 CHARGING |